Premium
Estimating Influence of Crystallizing Latent Heat on Cooling‐Crystallizing Process of a Granitic Melt and Its Geological Implications
Author(s) -
Bangton ZHANG,
Junqi WU,
Hongfei LING,
Peirong CHEN
Publication year - 2008
Publication title -
acta geologica sinica ‐ english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.444
H-Index - 61
eISSN - 1755-6724
pISSN - 1000-9515
DOI - 10.1111/j.1755-6724.2008.tb00594.x
Subject(s) - crystallization , latent heat , batholith , thermodynamics , materials science , atmospheric temperature range , geology , granitic rock , mineralogy , geochemistry , paleontology , physics , tectonics
Based on the theory of thermal conductivity, in this paper we derived a formula to estimate the prolongation period (Δ t L ) of cooling‐crystallization process of a granitic melt caused by latent heat of crystallization as follows: where T M is initial temperature of the granite melt, T C crystallization temperature of the granite melt, C p specific heat, Δ t col cooling period of a granite melt from its initial temperature ( T M ) to its crystallization temperature ( T C ), Q L latent heat of the granite melt. The cooling period of the melt for the Fanshan granodiorite from its initial temperature (900°C) to crystallization temperature (600°C) could be estimated ˜210,000 years if latent heat was not considered. Calculation for the Fanshan melt using the above formula yields a Δ t L value of ˜190,000 years, which implies that the actual cooling period within the temperature range of 900°‐600°C should be 400,000 years. This demonstrates that the latent heat produced from crystallization of the granitic melt is a key factor influencing the cooling‐crystallization process of a granitic melt, prolongating the period of crystallization and resulting in the large emplacement‐crystallization time difference (ECTD) in granite batholith.